JPS59108418A - Signal generating circuit - Google Patents

Signal generating circuit

Info

Publication number
JPS59108418A
JPS59108418A JP57217769A JP21776982A JPS59108418A JP S59108418 A JPS59108418 A JP S59108418A JP 57217769 A JP57217769 A JP 57217769A JP 21776982 A JP21776982 A JP 21776982A JP S59108418 A JPS59108418 A JP S59108418A
Authority
JP
Japan
Prior art keywords
voltage
circuit
transistor
switch
capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP57217769A
Other languages
Japanese (ja)
Inventor
Kenzo Fujie
藤栄 憲三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP57217769A priority Critical patent/JPS59108418A/en
Priority to GB08332876A priority patent/GB2134736B/en
Priority to US06/561,439 priority patent/US4611136A/en
Priority to DE3345297A priority patent/DE3345297C2/en
Publication of JPS59108418A publication Critical patent/JPS59108418A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K5/00Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/13Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K5/00Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/01Shaping pulses
    • H03K5/04Shaping pulses by increasing duration; by decreasing duration

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Pulse Circuits (AREA)
  • Manipulation Of Pulses (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To generate an accurate time signal without being affected by a power supply and temperature by comparing a discharge voltage of a time constant circuit with a reference voltage. CONSTITUTION:When a switch SW is turned on, a capacitor C is charged. A terminal voltage S2 of the capacitor C is equal to a reference voltage Va. An output S3 is generated from a comparison circuit 2 in this case. When the switch SW is turned off, a discharge current flows from the capacitor C to a resistor R. The terminal voltage S2 is reduced according to a time constant in this case. A voltage Vb dividing the reference voltage Va by resistors R1, R2 is given to one input of the comparison circuit 2. An output of the comparison circuit 2 is inverted when the terminal voltage S2 reaches the voltage Vb. The time until the voltage S2 reaches the Vb is decided independently of the absolute value of the voltages Va, Vb.

Description

【発明の詳細な説明】 本発明は、特にIC化に適した高精度の信号発生回路に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly accurate signal generating circuit particularly suitable for IC implementation.

従来の信号発生回路としては、第1図(A)に示すよう
なものがあった。
As a conventional signal generating circuit, there is one shown in FIG. 1(A).

同図において、1はタイミング信号発生回路、2は比較
回路、R1,R2は比較用抵抗、Vlは比較電圧、Ql
はスイッチング用トランジスタ、Rはタイミング用外付
抵抗、およびCはタイミング用外付コンデンサである。
In the figure, 1 is a timing signal generation circuit, 2 is a comparison circuit, R1 and R2 are comparison resistors, Vl is a comparison voltage, and Ql
is a switching transistor, R is an external resistor for timing, and C is an external capacitor for timing.

タイミング信号発生回路1から信号S+が発生すると、
スイッチング用トランジスタQ+ はターンオンし、S
2の電圧は第1図(B)のようにスイッチング用トラン
ジスタQ1のコレクタ飽和電圧V CESとなる。
When the signal S+ is generated from the timing signal generation circuit 1,
The switching transistor Q+ turns on and S
2 becomes the collector saturation voltage VCES of the switching transistor Q1 as shown in FIG. 1(B).

次に、信号S1が’Lo−”レベルになり、スイッチン
グ用トランジスタQlがターンオフすると、外付抵抗R
から外付コンデンサCに充電電流が流れる。このとき、
S2の電圧Eは、 で表わされる(第1図(B))。
Next, when the signal S1 becomes 'Lo-' level and the switching transistor Ql is turned off, the external resistor R
A charging current flows from the capacitor C to the external capacitor C. At this time,
The voltage E of S2 is expressed as (FIG. 1(B)).

よって、E =V 1 となるまでの時間Tは、となり
、E−■1となった時点で比較回路2が反転し、出力す
る。
Therefore, the time T required until E=V 1 becomes E-1, and the comparator circuit 2 inverts and outputs when E-1 becomes E-1.

しかしながら、従来の信号発生回路はこのように構成さ
れていたため、s2の電圧が比較電圧に等しくなるまで
の時間Tに、上式で示したように電源電圧Vccおよび
コレクタ飽和電圧V C20の項を含んでいる。
However, since the conventional signal generation circuit is configured in this way, the terms of power supply voltage Vcc and collector saturation voltage V C20 are added as shown in the above equation in the time T until the voltage of s2 becomes equal to the comparison voltage. Contains.

したがって、時間Tは電源電圧Vccの変動の影響を直
接受け、かつ、コレクタ飽和電圧V cEsはIC内部
で大きくばらつき、しかも温度変化もあるため、高精度
の時定数(T)の設定ができなかった。特に、電源電圧
Vccの小さな低電圧回路においては、誤差が大きかっ
た。
Therefore, the time T is directly affected by fluctuations in the power supply voltage Vcc, the collector saturation voltage VcEs varies widely within the IC, and there are also temperature changes, so it is not possible to set a highly accurate time constant (T). Ta. In particular, the error was large in a low voltage circuit with a small power supply voltage Vcc.

本発明の目的は、上記従来の技術の欠点を克服し、電源
電圧の変動や温度の変動、トランジスタのばらつきにも
影響を受けることがなく、かつ構成の簡単な、rc化に
適した高精度の信号発生回路を提供することにある。
It is an object of the present invention to overcome the drawbacks of the above-mentioned conventional techniques, to provide a high-precision device that is not affected by fluctuations in power supply voltage, temperature, or transistor variations, has a simple configuration, and is suitable for RC. The object of the present invention is to provide a signal generation circuit.

以下、図によって本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to the drawings.

第2図(A)は本発明の信号発生回路の基本構成を示す
ブロック図であり、第2図(B)は各ブロックの電圧波
形を示すものである。
FIG. 2(A) is a block diagram showing the basic configuration of the signal generating circuit of the present invention, and FIG. 2(B) shows voltage waveforms of each block.

同図(A)において、Vaは基準電圧、vbは比較電圧
、およびSWはスイッチである。
In the same figure (A), Va is a reference voltage, vb is a comparison voltage, and SW is a switch.

いま、タイミング信号発生回路1から信号S+が発生す
ると、同図(B)のようにスイッチswがオンとなり、
この間外付コンデンサCに充電電流が流れ、S2の電圧
Eば基準電圧Vaに等しくなっている。このとき、比較
回路2がら出方s3が発生している。
Now, when the signal S+ is generated from the timing signal generation circuit 1, the switch sw is turned on as shown in FIG.
During this time, a charging current flows through the external capacitor C, and the voltage E of S2 becomes equal to the reference voltage Va. At this time, an output signal s3 is generated from the comparator circuit 2.

次に、信号Slが“’ Low ”レベルになり、スイ
ッチSWがオフになると、外付コンデンサCがら放電電
流が外付抵抗Rを通して流れる。このとき、S2の電圧
Eは、 で表わされ、E=Vbとなるまでの時間Toは、Va となる。ここで、V b −(R2/ R1+ R2)
 Vaなので、 p+ と表わされる。
Next, when the signal Sl becomes "'Low" level and the switch SW is turned off, the discharge current from the external capacitor C flows through the external resistor R. At this time, the voltage E of S2 is expressed as follows, and the time To until E=Vb becomes Va. Here, V b - (R2/ R1 + R2)
Since it is Va, it is expressed as p+.

ずなわち、Va 、Vbの絶対値には無関係に比較用抵
抗Rr、R2の値のみによって、時間T。
That is, the time T is determined only by the values of the comparison resistors Rr and R2, regardless of the absolute values of Va and Vb.

が決定される。なお、タイミングの調整は、外付抵抗R
または外付コンデンサCの値を調整することによって可
能である。
is determined. The timing can be adjusted using an external resistor R.
Alternatively, this can be done by adjusting the value of the external capacitor C.

次に、実施例について説明する。Next, examples will be described.

第3図は、本発明の一実施例よりなる信号発生回路の回
路図である。
FIG. 3 is a circuit diagram of a signal generating circuit according to an embodiment of the present invention.

同図において、トランジスタQ1と02は差動ベアであ
り、トランジスタQBの定電流回路で駆動される。トラ
ンジスタQ3とQ4は電流ミラー回路であり、トランジ
スタQ3に流れる電流と等しい電流をトランジスタQ4
は流そうとする。
In the figure, transistors Q1 and 02 are differential bare, and are driven by a constant current circuit of transistor QB. Transistors Q3 and Q4 are a current mirror circuit, and a current equal to the current flowing through transistor Q3 is passed through transistor Q4.
tries to flow.

トランジスタQ5は電流増幅用であり、外付抵抗Rおよ
び外付コンデンサCに電流を流す。トランジスタQ1〜
Q5はトランジスタQ6により駆動される100%負帰
還のアンプであり、定電圧源とスイッチの動作を行なう
Transistor Q5 is for current amplification, and allows current to flow through external resistor R and external capacitor C. Transistor Q1~
Q5 is a 100% negative feedback amplifier driven by transistor Q6, and operates as a constant voltage source and a switch.

トランジスタQ7とQ8は差動ペアであり、電流源1o
によって駆動される。トランジスタQ@とQ+aは電流
ミラー回路であり、トランジスタQ7に流れる電流と等
しい電流をQ +oに流そうとする。トランジスタQ7
〜Q+oと電流源1oで構成されるものは、電圧利得の
非常に大きな増幅器であり、電圧比較回路2として動作
する。
Transistors Q7 and Q8 are a differential pair, with current source 1o
driven by. Transistors Q@ and Q+a are a current mirror circuit, which attempts to cause a current equal to the current flowing through transistor Q7 to flow through Q +o. transistor Q7
~Q+o and the current source 1o are an amplifier with a very large voltage gain, and operate as the voltage comparison circuit 2.

Vaば内部で発生される適当な大きさの電圧の電圧源で
ある。
Va is a voltage source of an appropriate voltage generated internally.

S+ は充放電のコントロールをするためのタイミング
信号であり、I(i″レベルときトランジスタQbのベ
ースに適当な大きさの電圧を与え、差動アンプを動作さ
せる。トランジスタQ2のベース、すなわち外付用端子
の電圧は、トランジスタQ1のベース、すなわち基準電
圧■aと等しくなる。このとき、外付抵抗Rと外付コン
デンサCには、トランジスタQ5から電流が供給される
S+ is a timing signal for controlling charging and discharging, and when it is at I(i'' level, it applies an appropriate voltage to the base of transistor Qb to operate the differential amplifier. The voltage at the terminal becomes equal to the base of the transistor Q1, that is, the reference voltage (a).At this time, the external resistor R and the external capacitor C are supplied with current from the transistor Q5.

このトランジスタQ5は、外付コンデンサCを十分速く
充電する能力をもつ。
This transistor Q5 has the ability to charge the external capacitor C sufficiently quickly.

信号S1が“Low”レベルになると、トランジスタQ
6に電流を流さな(なるため、トランジスタQ1〜Q5
はずべてオフとなり、外付コンデンサCは放電を始める
When the signal S1 becomes “Low” level, the transistor Q
6 (because of this, transistors Q1 to Q5
Everything turns off, and the external capacitor C starts discharging.

このとき、S2の電圧Eは、 となる。誤差成分はトランジスタQ7のベース電流分だ
けであり、十分にHFEの高いトランジスタを使うか、
あるいはダーリントン接続することによって、誤差を無
視することができる。
At this time, the voltage E of S2 is as follows. The error component is only the base current of transistor Q7, so it is necessary to use a transistor with a sufficiently high HFE.
Alternatively, the error can be ignored by making a Darlington connection.

電圧比較回路2のトランジスタQaのベースは、比較電
圧vbに固定されているため、E=Vbになったとき、
出力S3は“Low ”レベルとなる。
Since the base of the transistor Qa of the voltage comparison circuit 2 is fixed to the comparison voltage vb, when E=Vb,
The output S3 becomes "Low" level.

その時間Toは、すでに説明したように、2 To=−CR7!n□ R1+R2 となる。したがって、たとえ基準電圧Vaに温度特性あ
るいは電源電圧依存性があったとしても、時間Toには
全く影響を与えない。
As already explained, the time To is 2 To=-CR7! n□ R1+R2. Therefore, even if the reference voltage Va has temperature characteristics or power supply voltage dependence, it does not affect the time To at all.

この時間Toに影響を与える一因子はR2/R1+R2
であるが、このばらつきは、外付抵抗Rを半固定としこ
れを調整することによって補償できる。一度調整をして
おけば、抵抗R1とR2は同し温度特性(IC内部抵抗
)であるため、時間Toには影響を与えない。
One factor that affects this time To is R2/R1+R2
However, this variation can be compensated for by making the external resistor R semi-fixed and adjusting it. Once adjusted, since the resistors R1 and R2 have the same temperature characteristics (IC internal resistance), they do not affect the time To.

また、もう−因子としてCRがあるが、これは部品を選
択することにより補償できる。
Also, CR is another factor, but this can be compensated for by selecting parts.

外付コンデンサCは、第4図のように電源Vccに接続
してもよい。ただし、この場合には、電源リップルの影
響を受ける。
The external capacitor C may be connected to the power supply Vcc as shown in FIG. However, in this case, it is affected by power supply ripple.

また、第5図のように、トランジスタのNPNとPNP
とを逆にするように構成してもよい。
Also, as shown in Figure 5, the NPN and PNP transistors
It is also possible to configure the configuration to be reversed.

第6図(A)は、SRフリップフロップ3を併用して、
同図(B)のようにタイミング信号の前縁からの時間を
設定できるようにしたものである。
FIG. 6(A) shows the combination of SR flip-flop 3,
As shown in FIG. 3B, the time from the leading edge of the timing signal can be set.

すなわち、タイミング信号S+ によってSRフリップ
フロップ3をセントする。このQ信号により、スイッチ
SWがオフとなり、外付コンデンサCが放電を開始する
。S2の電圧がv6になると、電圧比較回路2の出力S
3が反転して“Hi”レベルとなり、SRフリップフロ
ップ3をリセットする。0信号は”Hi”となり、スイ
ッチSWをオンし、充電を始めるために出力S3がすく
にまた反転し、次の信号S+が入るまで充電状態で待機
する。
That is, the SR flip-flop 3 is turned on by the timing signal S+. This Q signal turns off the switch SW, and the external capacitor C starts discharging. When the voltage of S2 becomes v6, the output S of voltage comparator circuit 2
3 is inverted and becomes the "Hi" level, and the SR flip-flop 3 is reset. The 0 signal becomes "Hi", the switch SW is turned on, and the output S3 is immediately inverted again to start charging, and the battery waits in the charging state until the next signal S+ is input.

第7図(A)は、二つの電圧比較回路2,2′を使用し
てウィンドコンパレータとし、同図(B)のようにトリ
ガー信号からある遅延をもったパルスを発生するように
したものである。
Figure 7 (A) shows a window comparator using two voltage comparison circuits 2 and 2', which generates a pulse with a certain delay from the trigger signal as shown in Figure 7 (B). be.

これは、たとえばビデオ信号のキードクランプのキー信
号の発生に使用できる。
This can be used, for example, to generate a key signal for a keyed clamp of a video signal.

以上説明したように、本発明の信号発生回路においては
電源電圧に対する依存性がなく、IC内部と外部の温度
変動が異なっていても温度補償ができ、非常に高精度に
時定数を決定することかできる。
As explained above, the signal generation circuit of the present invention has no dependence on the power supply voltage, can compensate for temperature even if the temperature fluctuations inside and outside the IC are different, and can determine the time constant with extremely high accuracy. I can do it.

また、この回路は構成が簡単であり、外付用端子も1個
で済む。
Furthermore, this circuit has a simple configuration and requires only one external terminal.

【図面の簡単な説明】[Brief explanation of drawings]

第1図(A)(B)は従来の回路の回路図と波形図、第
2図(A)(B)は本発明の信号発生回路の基本構成を
示す回路図と波形図、第3図は一実施例よりなる回路図
、第4図、第5図はその変形例を示す回路図、第6図(
A)(B)は引用例よりなる回路図と波形図、および第
7図(A)(B)は他の転用例よりなる回路図と波形図
である。 ■・・・・・・タイミング信号発生回路、2・・・・・
・比較回路、R1,R2・・・・・・比較用抵抗、Va
・・・・・・基準電圧、vb・・・・・・比較電圧、R
・・・・・・外付抵抗、C・・・・・・外付コンデンサ
。 特許出願人   パイオニア株式会社 0 (A) (B) 第2図 (A) (B) SW+ (ON ) 第4図 第6図 (A) (B) 3 第7図 (B) Ss(OUT)
Figures 1 (A) and (B) are circuit diagrams and waveform diagrams of a conventional circuit, Figures 2 (A) and (B) are circuit diagrams and waveform diagrams showing the basic configuration of the signal generation circuit of the present invention, and Figure 3. is a circuit diagram of one embodiment, FIGS. 4 and 5 are circuit diagrams showing variations thereof, and FIG.
A) and (B) are circuit diagrams and waveform diagrams of cited examples, and FIGS. 7(A) and 7(B) are circuit diagrams and waveform diagrams of other diversion examples. ■・・・・Timing signal generation circuit, 2・・・・
・Comparison circuit, R1, R2... Comparison resistor, Va
...Reference voltage, vb...Comparison voltage, R
...External resistor, C...External capacitor. Patent applicant Pioneer Corporation 0 (A) (B) Fig. 2 (A) (B) SW+ (ON) Fig. 4 Fig. 6 (A) (B) 3 Fig. 7 (B) Ss (OUT)

Claims (1)

【特許請求の範囲】[Claims] タイミング信号によって駆動されるスイッチと、直流電
圧を分圧する分圧抵抗と、前記スイッチを介して直流電
圧によって充電される時定数回路と、前記スイッチのオ
フ時に前記分圧抵抗による電圧と前記時定数回路による
放電電圧とを比較する比較回路とを備えたことを特徴と
する信号発生回路。
a switch driven by a timing signal; a voltage dividing resistor that divides a DC voltage; a time constant circuit that is charged by the DC voltage through the switch; and a voltage generated by the voltage dividing resistor and the time constant when the switch is turned off. A signal generation circuit characterized by comprising a comparison circuit for comparing a discharge voltage generated by the circuit.
JP57217769A 1982-12-14 1982-12-14 Signal generating circuit Pending JPS59108418A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP57217769A JPS59108418A (en) 1982-12-14 1982-12-14 Signal generating circuit
GB08332876A GB2134736B (en) 1982-12-14 1983-12-09 Signal generating circuit
US06/561,439 US4611136A (en) 1982-12-14 1983-12-14 Signal delay generating circuit
DE3345297A DE3345297C2 (en) 1982-12-14 1983-12-14 Circuit for generating a signal delay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57217769A JPS59108418A (en) 1982-12-14 1982-12-14 Signal generating circuit

Publications (1)

Publication Number Publication Date
JPS59108418A true JPS59108418A (en) 1984-06-22

Family

ID=16709440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57217769A Pending JPS59108418A (en) 1982-12-14 1982-12-14 Signal generating circuit

Country Status (4)

Country Link
US (1) US4611136A (en)
JP (1) JPS59108418A (en)
DE (1) DE3345297C2 (en)
GB (1) GB2134736B (en)

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Also Published As

Publication number Publication date
US4611136A (en) 1986-09-09
GB8332876D0 (en) 1984-01-18
DE3345297A1 (en) 1984-07-05
GB2134736B (en) 1986-12-03
DE3345297C2 (en) 1986-08-28
GB2134736A (en) 1984-08-15

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